#include <iostream>
#include <string>
using std::cout;
using std::endl;
using std::string;

void test0(){
    string str1("hello,");
    string str2("world");
    string str3 = str1 + str2;
    cout << str3 << endl;
}

void test1(){
    string str1;
    cout << str1 << endl;

    string str2(5,'a');
    cout << str2 << endl;
}

int main(void){
    test1();
    return 0;
}
